Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f90f1f84678950…

MALICIOUS

PDF

73.0 KB Created: 2021-09-07 05:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74c6e9f6de46153248e77024de81da8f SHA-1: 94e5374c174a1e99199c637fd1e3cf8c432cb347 SHA-256: f1f90f1f84678950dacad03027258e10f161b3ee552703c81ee8908001b10fdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these link farms and the overall detection by security tools strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://tdvvietnam.vn/webroot/img/files/20349998156.pdf In PDF document text
    • http://leebyunghun.kr/new/upload/board/files/donorexu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f315e9d7f1---82785603618.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/64865652485.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/rutikorenipisasipa.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/niruwegogosu.pdfIn PDF document text
    • http://antae.be/app/webroot/uploads/file/semulujifi.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8b669b090---41210635053.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160782d45cf5fc---fotifegodikasexi.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/82146666294.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/58891035162.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/fimurutenozudadijage.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/37429537809.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/88233480721.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126630bbd525---rebifuxixetijota.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/89374446318.pdfIn PDF document text
    • http://falerisztika.hu/tmp/7642822857.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/8eab490d963fa1ec8ebedd0692c56d90/12435732908.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/35886740173.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074387d7541b---22225284220.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/66141801531.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/36918cf7d7caadd0deca13065c47de59/92629900307.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/67856173614.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/natolakovujokobal.pdfIn PDF document text
    • https://parfumzone.ro/files/file/wawumabugolegarelar.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/62342497111.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/jonikixazejetewefoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=brahmacharya+diet+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D6 10612 bytes
SHA-256: 19c9391d8d9ee67a24611a3d4416d5a7bbb8bc7f1cca8b012745c8f65ce78c51
font_02_sfnt_off0000e928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE928 17440 bytes
SHA-256: f7c9c8d9bdad99d675f143ff0355d1aad852ed998c29daceb9143e0310ed0353

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